CVE-2022-24880: flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored

Q: How do I fix CVE-2022-24880?

flask-session-captcha: upgrade to 1.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2022-24880 being exploited?

CVE-2022-24880 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-24880 affect?

CVE-2022-24880 affects flask-session-captcha. Severity is medium (CVSS 5.3). flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. In versions prior to 1.2.1, he `captcha.validate()` function would return `None` if passed no value (e.g

Q: How urgent is CVE-2022-24880?

Priority 41/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.3REMOTEUPGRADE

CVE-2022-24880 is a medium-severity flaw (CVSS 5.3) affecting flask-session-captcha. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. In versions prior to 1.2.1, he `captcha.validate()` function would return `None` if passed no value (e.g. by submitting an having an empty form). If implementing users were checking the return value to be **False**, the captcha verification check could be bypassed. Version 1.2.1 fixes the issue. Users can workaro

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-253, CWE-394, CWE-754
Published	2022-04-25
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: flask-session-captcha project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-25 22:15 UTCPublished CVE record published
2026-06-17 04:32 UTCUpdated Record last modified

flask-session-captcha project flask-session-captcha UPGRADE

Affected: < 1.2.1

Fixed in: 1.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flask-session-captcha || rpm -q flask-session-captcha || flask-session-captcha --version

2. UPGRADE to 1.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flask-session-captcha

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flask-session-captcha

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-24880?

flask-session-captcha: upgrade to 1.2.1. Exact commands for each OS are on this page.

Is CVE-2022-24880 being exploited?

CVE-2022-24880 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-24880 affect?

CVE-2022-24880 affects flask-session-captcha. Severity is medium (CVSS 5.3). flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. In versions prior to 1.2.1, he `captcha.validate()` function would return `None` if passed no value (e.g

How urgent is CVE-2022-24880?

Priority 41/100. Remotely exploitable, no login, no user action

Software pages

Flask vulnerabilities

References

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